LLY Duramax Alternator 2004 - Remanufactured Direct-Fit Diesel Replacement

Overview

This is an direct-fit alternator for the LLY Duramax diesel (2004). It is professionally remanufactured to OEM specification for a professional-grade repair that restores proper function and reliability to your truck.

What It Does & How It Helps

The alternator charges the batteries and powers the truck's electrical system, and diesels lean on it hard for glow/grid heaters. A failing alternator causes dim lights, dead batteries, and no-starts. A fresh unit restores full charging output.

Fitment

Confirm your engine and model year before ordering. Not sure it fits? Email sales@coredieselparts.com with your VIN or engine and year and we will confirm the correct unit.

Ordering & Core

This is a made-to-order remanufactured unit and typically ships within 2–5 business days. If a refundable core charge applies, it is fully refunded when your old unit is returned using the prepaid label provided. Questions? We are happy to help.